THR's Summer Box Office Award

6:00 AM PDT 9/4/2012 by Pamela McClintock

Superheroes soared, movie stars struggled and a trash-talking bear battled Channing Tatum's abs as a dip in overall grosses puts Hollywood on edge.

Labor Day bought sobering news for Holly- wood: Summer moviegoing in North America was at its lowest level in at least 20 years, while revenue ($4.27 billion) was down 3 percent from a record $4.4 billion in 2011. Here's a look at what worked and what didn't (grosses are worldwide).